A cautionary tale

[chas820]

Hi guys and gals,just thought i would mention something about my crash bars.As some of you know screwing steel bolts into alloy is a recipe for corrosion,mismatched metals etc.Anyway four weeks ago i fitted my crash bars and in my hurry to get them done i neglected to put copper grease around the threads so today i remembered and decided to unbolt and grease them.Already in only four weeks the alloy threads in the engine have started to powder,so people if you have not copper greased yours now might be a good time before the bike gets to old and you start stripping threads []

Regards Del

 

[Schtum]

I'd have thought that copper grease might make galvanic corrosion worse, rather than prevent it.

You might be better off using this stuff or something similar....

http://www.ruggedroads.co.uk/shop/a...---45g-Tube.html?shop_param=cid=98&aid=25002&

 

[bob the grizz]

Engine bars

Put mine on today Copper grease

 

[Greggers]

That's why BM bolts are usually passivated or galvanised to fek ... or use stainless - which is what try to do wherever possible.

G

 

[chas820]

I'd have thought that copper grease might make galvanic corrosion worse,

You might well be right,i`m not a metalurgist,i always use copper grease on bolts and so far have had no problems.Any metalurgists out there?

 

[boatman]

we work in the marine trade and the royal national lifeboats we service and refit have huge numbers of fastenings into alloy which is regularlly doused in seawater their specification is to use A4 bolts with denso paste smeared on them ,it seems to do the trick

we have found that sometimes the copaslip and certain grades of alloy can react very badly particularly if it is somewhere damp

 

[divelandy]

Yep, coppaslip + sea = bad...

Where different metals come into contact which you can't separate, corrosion's going to happen!

 

[Klanky]

If you coppaslip them, you are providing a nice conductor for the more noble steel to munch it's way through the ally.

Use something non-conductive if you think corrosion's going to be a problem.

Or weld 10kg 'MG Duff' anodes to each side of your crashbars.



Low down, obviously.

 

[chas820]

If i used LM grease instead ,would that be better?

 

[boatman]

mg duff anodes! nuntin but ra best for klankers. We hae tae buy the cheapie generic type us puir boat builders
cheers

 

[boatman]

If i used LM grease instead ,would that be better?

yep that,l work

 

[bob the grizz]

Corrosive

If I used stainless fasteners with copperslip, when I fitted my engine bars, could this still cause a later problem

 

[v8legend]

If I used stainless fasteners with copperslip, when I fitted my engine bars, could this still cause a later problem

I'm not sure if the copperslip is going to cause problems. But remember the 3 T's. If it's got Tits or Tyres, then you've got Trouble.